Brisket
In a small bowl, combine all of the spices. Place the brisket in a glass dish and thoroughly rub all over with the spice mixture.
Season generously with pepper. Cover the dish tightly with plastic wrap. Refrigerate overnight.
The next morning, preheat the oven to 325°F (165°C). Let the brisket sit out at room temperature for 30 minutes.
In a 3.5 L Braiser over medium heat, sear the brisket until nicely browned on all sides in the oil (be careful not to burn the spices). Set the brisket aside.
Add the onions to the Braiser and season with salt. Add more oil as needed. Cook over medium heat, stirring occasionally, until nicely caramelized, about 15 minutes. Add the garlic and deglaze with the beef stock.
Place the brisket, fat-side up, over the onions. Cover and cook in the oven for 2 hours.
Remove the brisket from the Braiser and place on a cutting board. When the brisket is cool enough to handle, thinly slice against the grain. Return the sliced brisket to the Braiser. Add the beer and vinegar. Cover and let sit until it is about 2 hours before ready to serve.
To finish the brisket, cook, covered, in the oven for 1 hour. Add the carrots and parsnips to the Braiser. Season with salt and pepper. Add more beef stock as needed (the brisket should be covered halfway by the cooking liquid). Cook, covered, for 1 hour or until the vegetables are fork-tender.
Gremolata
While the brisket is cooking, combine all of the ingredients in a bowl. Season with salt and pepper to taste. Refrigerate until ready to serve.
Serve the brisket with the vegetables and pan juices. Garnish with the gremolata and serve with green vegetables.